CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Phase Relations and Pressure-Volume-Temperature Equation of State of Galena |
FAN Da-Wei1, ZHOU Wen-Ge1, WEI Shu-Yi1,3, LIU Jing2, LI Yan-Chun2, JIANG Sheng2, XIE Hong-Sen1 |
1Laboratory for Study of the Earth's Interior and Geofluids, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002 2Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049 3Graduate University of the Chinese Academy of Sciences, Beijing 100049 |
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Cite this article: |
FAN Da-Wei, ZHOU Wen-Ge, WEI Shu-Yi et al 2010 Chin. Phys. Lett. 27 086401 |
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Abstract The phase relations and pressure volume dependences of galena (PbS) under high pressure and high temperature are investigated by means of in situ observation using resistance heating in a diamond anvil cell and synchrotron radiation. The phase transition from NaCl type to TlI type takes place at approximately 2.4 GPa. A fit to the high temperature third-order Birch-Murnaghan equation of state yields an isothermal bulk modulus K0 = 37(3) GPa, and its pressure derivative K'0 =3.6(3), the temperature derivative of the bulk modulus (8706;K/8706;T)P=-0.022(9) GPaK-1, and the thermal expansion coefficient α0 =2.2(5)× 10-5 K-1 for TlI-type galena. The linear compressibilities β along a, b and c directions of TlI type is elastically anisotropic (βa =3.4× 10-3 GPa-1, βb =1.4×10-4 GPa-1 and βc =1.6× 10-3 GPa-1). We obtain the temperature derivative of the bulk modulus (8706;K/8706;T)P and thermal expansion coefficient α0 for TlI-type galena for the first time.
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Keywords:
64.30.Jk
07.35.+k
07.85.Qe
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Received: 07 April 2010
Published: 28 July 2010
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PACS: |
64.30.Jk
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(Equations of state of nonmetals)
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07.35.+k
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(High-pressure apparatus; shock tubes; diamond anvil cells)
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07.85.Qe
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(Synchrotron radiation instrumentation)
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